<div class="list-group" id="myList">
<a href="#" class="list-group-item list-group-item-action" id = "letActive"> Cras justo odio </a>
<a href="#" class="list-group-item list-group-item-action active">Dapibus ac facilisis in</a>
<a href="#" class="list-group-item list-group-item-action">Morbi leo risus</a>
<a href="#" class="list-group-item list-group-item-action">Porta ac consectetur ac</a>
<a href="#" class="list-group-item list-group-item-action " >Vestibulum at eros</a>
</div>
$(".list-group-item").click(function () {
$(".list-group-item").siblings("a").removeClass("active");
$(this).addClass("active");
});